Citation: Peng-Fei Cheng, Ting Feng, Zi-Wei Liu, De-Yao Wu, Jing Yang. Laser-direct-writing of 3D self-supported NiS2/MoS2 heterostructures as an efficient electrocatalyst for hydrogen evolution reaction in alkaline and neutral electrolytes[J]. Chinese Journal of Catalysis, 2019, 40(8): 1147-1152. doi: S1872-2067(19)63390-5
激光直写制备三维自支撑NiS2/MoS2复合电催化剂应用于碱性和中性电解水制氢
本文使用毫秒激光直写法在镍泡沫上合成了三维（3D）自支撑的NiS2/MoS2异质结构，并将其直接用作电解水析氢反应电极，后者在碱性和中性电解质中都表现出了优异的HER活性.毫秒激光直写法具有瞬时高温和快速冷却的特点，常用于纳米材料的制备.毫秒激光作用于溶液中的泡沫镍时，由于瞬间高温使其气化，与溶液中的离子、分子等组成了等离子体，随后借助液体环境的急速冷却限制效应，这团高温混合物在靶材表面原位生长出NiS2/MoS2纳米复合催化剂.通过物相表征，发现NiS2/MoS2异质结构是由高度分散的小尺寸NiS2纳米粒子和MoS2纳米片组成，这些纳米片具有较大的比表面积以及大量NiS2与MoS2之间的界面.借助宏观XPS表征，我们可以确认在NiS2/MoS2异质结构的界面处存在强烈的电子相互作用，说明复合材料两相之间存在异质界面.而异质界面可以作为HER反应过程中的催化位点，有利于水分子的裂解吸附，从而提升复合材料的催化性能.我们对NiS2/MoS2复合催化剂在碱性（1 mol L-1 KOH）和中性（1 mol L-1 KBS）条件下分别进行了HER性能测试.结果表明，在10 mA cm-2的电流密度下，催化剂在碱性和中性电解质中的过电势分别为98和159 mV，Tafel斜率分别为88和130 mV dec-1，并且催化剂具有高效的电荷转移和大的电化学活性表面积，性能优于同体系的其他催化剂.
English
Laser-direct-writing of 3D self-supported NiS2/MoS2 heterostructures as an efficient electrocatalyst for hydrogen evolution reaction in alkaline and neutral electrolytes
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Key words:
- Heterostructure
- / Hydrogen evolution reaction
- / Laser-direct-writing
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